Question

4 grams of hydrogen reacts with some grams of oxygen to make 36 grams of water.figure out how much oxygen must have been used by applying law of conservation of mass
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Answer 1

Answer:32

Explanation:

36g=xg+4g

Answer 2

Answer:

Explanation:

The chemical reaction for the formation of water is:

2H₂ + O₂ → 2H₂O

Now,

36 × 1/18 = 2 moles of water

4 g of H₂ × 1/2 = 2 moles of hydrogen

On applying the law of conservation of mass, two moles of hydrogen and 1 mole of oxygen reacts to produce 2 moles of water.

Thus, one mole of oxygen is required to produce 2 moles of water.

1 mole of oxygen × 32 g/mole of water = 32 g of oxygen